Light of Sight - 2D Dynamic Lighting (Field of View)

Hi,

I am using a Light of Sight - 2D Dynamic Lighting It is a free plugin!

And I need to do a similar effect to that:

I need the field of view of light illuminate the "floor" while the rest of the screen remains dark. I do not know how I can do this, but I know that it is possible ... I do not understand anything about Shaders! :(

Any help will be very useful to me! If you need an example, my project is attached to this question. HERE

Thank you in advance!